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A novel type of acuity measurement, which we refer to as 'differential acuity', requires the observer to identify one unique target among three others which are identical. This is a proof of concept study aimed to determine if differential acuity is equivalent to standard measures of recognition acuity. To create a range of visual acuity, vision wa...

Diurnal birds of prey (raptors) are considered the group of animals with highest visual acuity (VA). The purpose of this work is to review all the information recently published about the visual system of this group of animals. A bibliographic search was performed in PubMed. The algorithm used was (raptor OR falcon OR kestrel OR hawk OR eagle) AND ...

To determine whether the assessment of visual acuity ratios might improve the referral of children with (sub)normal visual acuity but at risk of cerebral visual impairment. In an exploratory study, we assessed visual acuity, crowding ratio and the ratios between grating acuity (Teller Acuity Cards-II) and optotype acuity (Cambridge Crowding Cards) ...

A 48 year-old woman with visual acuity loss in left eye (0.3). Funduscopic examination showed papillary oedema and neovascular membrane in the left eye. All neurological tests were normal, except the lumbar puncture with opening pressure of 35cmH2O, being diagnosed with idiopathic intracranial hypertension (IIH). After four doses of bevacizumab, th...